Wii Updating

I haven't really followed anything here for months, maybe even a year now, and just need to know how to get updated from 3.3U to whatever the safest, newest software there is now. I tried to look, and you got half the people saying that it's ok to update to 4.2 while the other half says there's a lot of problems that follow it up. But yeah, I have a modchip in there, it has the Homebrew Channel and all that, and it's not going to be too mcuh fun going through putting that back again. Just don't want to do anything to screw anything at this point.